Which hygiene claim is not supported by reserch

A. Hand soap prevents disease better than antibacterial soap
Explanation
Previous research has supported that regular cleaning of teeth could improve dental health of a person. It is advisable that we wash our hands after going to the toilet/latrines because hand washing could kill germs and bacteria that are invisible by our naked eyes thus prevent us from diseases. Dentists have advised that brushing with fluoride toothpaste helps to prevent cavities.

Answer(c) eat nutritious meals;

Answer charlie should immediately start an exercise and diet program because all his test indicate that he is extremely obese;